SQL IF EXISTS in RPGIV
[Pages:10]SQL IF EXISTS in RPG IV
SQL iQuery Scripting
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What is SQL "IF EXISTS"
? Tests if the subselect produces any rows ? If rows are returned, the IF test is true ? If no rows are returned, the IF test is false ? SQL UDFs and "stored" Procedures support IF Exists tests ? SQL iQuery Supports IF Exists tests ? What about RPG?
SQL iQuery Script
If a record exists that matches the WHERE clause, then DO.
RPG IV IF Exists
5770ST1 V7R3M0 160422 4
Create SQL ILE RPG Object
IFEXISTS
DIAGNOSTIC MESSAGES
EXEC SQL IF EXISTS (SELECT * FROM DATALIB.ORDHIST
5770ST1 V7R3M0 160422
Create SQL ILE RPG Object
IFEXISTS
DIAGNOSTIC MESSAGES
MSG ID SEV RECORD TEXT
SQL0199 30
4 Position 22 Keyword IF not expected. Valid tokens: ( CL
END GET SET CALL DROP FREE HOLD LOCK OPEN WITH ALTER BEGIN.
What Can We Do in RPG?
? RPG IV does not support IF EXISTS ? Using RPG and SQL we can work around this limitation
How to Code "IF EXISTS" in RPG IV with SQL
? IF EXISTS does not exist in RPG
? However RPG does have IF statement itself
? RPG supports the SQL WHERE EXISTS clause ? We can combined RPG with SQL to simulate the "IF EXISTS" condition
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